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CXA2549M
RF Amplifier for CD Players
Description The CXA2549M is an IC developed for compact disc players. This IC incorporates an RF amplifier, focus error amplifier, APC circuit and RF level control circuit. (The voltage-converted optical pickup output is supported.) Features * Low power consumption (45 mW at 2.5 V) * High-band RF amplifier * APC circuit * RF level control circuit * Both single power supply and dual power supply operations possible. * Compatible with pickup for LC and PD Applications Compact disc players Structure Bipolar silicon monolithic IC Block Diagram and Pin Configuration
(50%/30%/OFF)
24 pin SOP (Plastic)
Absolute Maximum Ratings (Ta=25 C) * Supply voltage VCC 12 V * Operating temperature Topr -20 to +75 C * Storage temperature Tstg -65 to +150 C * Allowable power dissipation PD 650 mW Operating Conditions Supply voltage VCC--VEE 4.5 to 5.5
V
AGCCONT
AGCVTH
LC/PD
LD ON
RFTC
RF_I
RFO
VCC
RFE
FE_BIAS
FE
TE
24
23
22
21
20
19
18
17
16
15
14
13
VCC
RF_EQ_AMP
5.7K
APC LD AMP
56k
25p
VCC
FPCUS ERROR AMP
25.4K
VC
50A
174k
15K
17.4K
670mV
56k
10k
10k
1k
VC
5K
164k
87k
13.4k
RF SUMMING AMP
VCC
10k
14K
25p VC
55k
VC VREF 1.25V VC
23.8k
23.8k
158.45k
w
w
w
.d
sh ta a
ee
VEE
EO
LD
C
A
E
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
PD
--1--
VC
EI
D
B
F
u. t4
1
260k
12p
VEE
VC BUFFER
23.3K
23.3K
23.3K
23.3K
24K
24K
24K
24K
260k
VEE VC
R34
147
om c
VEE
12p
VC
26k
13k
820k
820k
VCC
10k
30k
30k
VC 11 12
2
3
4
5
6
7
8
9
10
E97428-TE
www..com
158.45k
TRACKING ERROR AMP
VC 42.6K
R26
VC
15k
VEE
VC
CXA2549M
Pin Description Pin No. Symbol IO Equivalent circuit Description
VCC VCC 10k 1k 55.7k
1
LD
O
1
Output pin of APC amplifier.
VEE
VCC 17
2
PD
I
2
55k 147 10k
Input pin of APC amplifier.
VEE VEE
VEE VEE
VCC 24k 23.2k
VCC
VCC
VCC
A3
25p
3 4 5 6 14
A B C D FE BIAS
I I I I I
B4
24k 23.2k
14k
174k
4.2k C5 24k 23.2k 100 8
87k 25p
Input pin of RF and FE amplifiers for Pins 3, 4, 5 and 6; focus bias adjustment for Pin 14.
D6
24k 23.2k
VEE
VC
VEE 164K
VC 14 FE BIAS
7
VEE
--
VEE.
--2--
CXA2549M
Pin No.
Symbol
IO
VCC
Equivalent circuit
VCC VCC VCC
Description Input pin of tracking error amplifier for Pins 8 and 9. An external resistor for V-I conversion should be connected because these pins are for current input. Gain adjustment of input signal from Pin 9 for Pins 10 and 11. Pin 23 is a bias for LC when connected to VCC and for PD IC when left open.
VCC VCC
12p 12p 147 11
8 9 10 11 23
F E EI EO LC/PD
I I -- -- I
147
260k
8
820k 23 820k 147 96.3k 8 VEE VC 96.3k 23.8k 8 VEE VC
9
260k 10
8
300
VCC
VCC 200
120
12
VC
O
147 12 120
15k
16k
DC voltage output pin of (VCC+VEE)/2. Connect to GND when dual power supply (2.5 V) is used; connect a smoothing capacitor when single power supply (+5 V) is used.
VEE
VCC
13
TE
O
147 13
158.45k
Output pin of tracking error amplifier. The F-E signal is output.
10p 400 VEE
VCC
VEE
25p
15
FE
O
147 15
174k
Output pin of focus error amplifier.
10p 400 VEE VEE
--3--
CXA2549M
Pin No.
Symbol
IO
Equivalent circuit
Description
25.4k 5.7k
25
16
REF
--
16 5k
Equalizing pin of RF amplifier. Frequency response can be adjusted by connecting CR to this pin.
VCC
147
25.4k
17
RFO
O
17 60k 800
Output pin of RF amplifier.
147 18
18
RF_I
I
15k
Input pin of RF amplifier output RFO with capacitance coupled.
20
19
RFTC
--
147 19 50
50
External time-constant pin for RF level control.
10
50 147
20
AGCVTH
--
20 13.4k 10
Variable pin of reference level for RF level control. The reference level can be varied by the external resistor.
--4--
CXA2549M
Pin No.
Symbol
IO
Equivalent circuit
Description
15
15
21
AGCCONT
I
147 21 50k 7
RF level control ON (limit level of 50 % / 30 %)/ OFF switching pin. 50 % for VCC, 30 % for open or VC and OFF for VEE.
VCC 50 147
22
LD ON
I
22 VREF
ON/OFF selection pin of APC amplifier. ON for VCC and OFF for VEE.
30k
VEE VEE
VEE
VEE
24
VCC
--
VCC
--5--
Electrical Characteristics
Bias conditions and measurement method Input GND Input GND Input GND Input 1 kHz 100 mVp-p. Output AC measurement Output DC measurement Output DC measurement Input GND Output DC measurement -- -30.0 20.3 20.3 -3.0 Output DC measurement Output DC measurement input GND Output DC measurement 1.9 -25 21.9 21.9 -3.0 Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement 1 1 1 0 A 1 LD OFF I1=0.8mA Output DC measurement Output DC measurement Level control : 50 % (E4 : 3.8 V) O 50 mV 2.0 V 3.8 V/1.3 V 700 A -Level control OFF (E4 :1.3 V) Level control : 30 % (E4 : 3.3 V) O 50 mV 2.0 V 3.3 V/1.3 V 700 A 1 -Level control OFF (E4 :1.3 V) Level control : -50 % (E4 : 3.8 V) O 800 mV 2.0 V 3.8 V/1.3 V 170 A 1 -Level control OFF (E4 : 1.3 V) Level control : -30 % (E4 :1.8 V) O 800 mV 2.0 V 1.8 V/1.3 V 170 A 1 12 -Level control OFF (E4 : 1.3 V) Output DC measurement 1.9 -- -- -1.5 0.6 2.1 -- 2.2 19.9 -- -- 0 23.3 23.3 0 -- -- 10 24.9 24.9 0 -- -- -1.7 0 2.0 2.3 -- 45 27.9 27.9 3.0 -- -1.9 -0.3 1.1 -- -- 0 -2950 -2350 -1150 Output DC measurement -35 --10 22.9 -11.61 -8.6 5.59 8.6 11.61 -5.59 15 25.9 -- -2 30.0 26.3 26.3 3.0 -1.9 mA mA mV dB V V mV dB dB dB V V mV dB dB dB V V V V V V V mV Min. Typ. Max. Unit Description of I/O waveform
2.5 V power supply (VCC=2.5 V, VEE=-2.5 V, VC=GND)
SW conditions
Measurement item 6 E1 24 7 17 17 O 280 mV -280 mV 15 15 15 15 O 310 mV 310 mV 13 13 O 13 O 270 mV 270 mV 2.0 V 2.0 V 2.0 V 0.5 V O 2.0 V 1.3 V 1.3 V 0 A 1.3 V 590 A 1.3 V 410 A 1 1.3 V 230 A 1 13 OO 13 13 V13-4=V13-2-V13-3 15 O 15 V15-4=V15-2-V15-3 Input 1 kHz 100 mVp-p. Output AC measurement Input 1 kHz 100 mVp-p. Output AC measurement 17 O 17 E2 E3 E4 I1 7 8 9 10
Symbol
Measurement No.
1
2
Current consumption
ICC
IEE
3
Offset voltage 1
V17-1
4
Voltage gain
V17-2
OOOO
RF amplifier
5
Maximum output amplitude H
V17-3
OOOO
6
Maximum output amplitude L
V17-4
OOOO
7
Offset voltage
V15-1
8
Voltage gain 1
V15-2
O
O
9
Voltage gain 2
V15-3
O
O
FE amplifier
10
Voltage gain difference
V15-4
11
Maximum output amplitude L
V15-5
O
O
12
Maximum output amplitude H
V15-6
O
O
13
Offset voltage 1
V13-1
Measurement pin
1
2
3
4
5
14
Voltage gain 1
V13-2
O
Input 1 kHz 140 mVp-p. Output AC measurement Input 1 kHz 140 mVp-p. Output AC measurement
15
Voltage gain 2
V13-3
TE amplifier
22
APC
RF level control
--6--
16
Voltage gain difference
V13-4
17
Maximum output amplitude H
V13-5
O
18
Maximum output amplitude L
V13-6
19
Output voltage 1
V1-1
20
Output voltage 2
V1-2
21
Output voltage 3
V1-3
Output voltage 4
V1-4
23
Maximum output amplitude
V1-5
24
50 % limit
V1-6
OOOO
25
30 % limit
V1-7
OOOO
-1620 -1120
-120
mV
26
-50 % limit
V1-8
1550
2350
2800
mV
27
-30 % limit
V1-9
598 -100
1098 --
1598 100
mV mV
28
Center output voltage
V12-1
O in the SW conditions represents the ON state.
CXA2549M
Electrical Characteristics Measurement Circuit
GND GND VEE VEE GND GND GND
GND GNDGND
GND VEE
VCC
R1
1M C3
0.1
C1
33
A
R3 R5 R8 R9 10k 10k S10
E3 22 21 20 19 18 17 16 15 14 E4
E2
S9
24
23
10k
13
VCC
RF_I
LC/PD
LD ON
RFTC
RFO
RFE
FE
AGCCONT
AGCVTH
LD
A
C
VEE
E
EO
FE_BIAS
PD
B
D
F
1
150k C4 33 R2
2
3
4
5
6
7
8
R4
9
150k
10
EI
11
12
S8
R7
S1
S3
S2
S4
A
R1
R6
26k
0.8mA
300
S5
S6
13k
GND
VCC
VCC VEE
GND
VEE GND AC E1
S7
I2
I1
GND
GND CXA2549M
VC
TE
10k
--7--
CXA2549M
Description of Functions RF Amplifier Each signal current from the photodiodes A, B, C and D is I-V converted, and input to Pins 3, 4, 5 and 6. These signals are added by the RF summing amplifier and equalized by the RF equalizing amplifier and then output to Pin 17. When the RF signal is equalized, an equalizing circuit is added to Pin 16.
A I-V A B I-V B C I-V C D I-V D
3
24k RF SUMMING AMP 5.7k RF EQAMP 5k 25.4k 17 RFO RFOUT 16 REF
4
24k
14k
5
24k 4.2k 4.3k
6
24k VC VC
GND
Focus Error Amplifier The operation of (B+D)-(A+C) is performed and the signal is output to Pin 15. Pin 14 is used for bias adjustment of the focus error signal.
A I-V A B I-V B C I-V C D I-V D
3
23.3k
4
23.3k 25p 174k 23.3k 87k 25p 164k FOCUS ERROR AMP 15 FE FEOUT VCC
5
6
23.3k VC
14 FE BIAS
FOCUS 47k BIAS GND
GND
--8--
CXA2549M
Tracking Error Amplifier Each signal current from the photodiodes E and F is I-V converted and input to Pins 8 and 9 via an input resistor which determines the gain. The signal is amplified by the gain amplifier, operated by the tracking error amplifier and then the (F-E) signal is output to Pin 13. The E input gain can be adjusted by Pin 11. Pin 23 can be used as a bias for LC when connected to VCC and as a bias for PD IC when left open.
260k VC F I-V 150k E I-V 150k EI
26k VC 13k 23.8k 158.45k
23
LC/PD
8
820k 820k 12p 23.8k
13 TRACKING ERROR AMP 158.45k VC VC
TE TEOUT
9
TRK E GAIN EO 22k 22k
10 260k 12p
11
GND
--9--
CXA2549M
APC & Laser Power Control
VCC R1 22 C2 100 LD
1
R6 1k VCC
L1 10H 130mV PD C1 1 R3 100 R2 500 LD PD VEE R4 10k VEE R5 55k R8 10k
R10 56k
LD ON 22
MICRO COMPUTER
2
R11 10k VL
R12 56k VREF VEE
GND
R14 12.5k RF_I C3 0.01 RFO 17 R9 17.4k RF VC VC 19 20 670mV R15 13.4k 18 1.1Vp-p 15k R7 1.9V 42.6k 50
AGCCONT 21
MICRO COMPUTER
R13 1M
C4 1
VEE VEE
* APC When the laser diode is driven by a constant current, the optical power output has extremely large negative temperature characteristics. The APC circuit is used to maintain the optical power output at a constant level. The laser diode current is controlled according to the monitor photo diode output. APC is set to ON by connecting the LD ON pin to VCC ; OFF by connecting it to VEE. * Laser Power Control (LPC) The RF level is stabilized by attaching an offset to the APC VL and controlling the laser power in sync with the RF level fluctuations. The RFO and RF_I levels are compared and the larger of the two is smoothed by the RFTC's external CR. This signal is then compared with the reference level. The laser power is controlled by attaching an offset to VL according to the results of comparison with the reference level. Set the reference level to 670 mV. (center voltage reference) When the reference level is changed, connect the external resistor to the AGCVTH pin (Pin 20). The reference level can be lowered by connecting the resistor between Pin 20 and the center output voltage or between Pin 20 and VCC. The AGCCONT pin (Pin 21) is used to switch the level of the laser power control circuit ; OFF, ON (laser power limit of 30 %) and ON (laser power limit of 50 %) For the laser power limit, 50 % is recommended for PD IC ; 30 % for LC. AGCCONT L (VEE) M (VC or OPEN) H (VCC) LPC OFF ON ON LPC limit -- 30 % 50 % VL variable range Approximately 1.27 V Approximately 1.27 V350 mV Approximately 1.27 V570 mV --10--
AGCVTH
RFTC
CXA2549M
Center Voltage Generation Circuit This circuit provides the center potential when this IC is used at single power supply. The maximum current is approximately 3 mA. The output impedance is approximately 147 . Connect this circuit to GND when used at dual power supply.
VCC
VCC
30k VC BUFFER VC 12 147 30k 15k VEE VEE
33/6.3V
VC 33/6.3V
Notes on Operation 1. Power supply The CXA2549M can be used either at dual power supply or single power supply. The table below shows the connection of power supply for each case. VCC +power supply Power supply VEE -power supply GND VC GND OPEN
Dual power supply Single power supply
2. Laser Power Control The RF level is stabilized by attaching an offset to the APC VL and controlling the laser power in sync with the RF level fluctuations. Therefore, use this circuit in the state where the focus servo is applied. The laser life is shortened by increasing the laser power when the less light is reflected from the disc. It is recommended that the typical laser power value is set lower to maintain the laser life. Take care of the laser maximum ratings when using the laser power control circuit.
--11--
CXA2549M
Application Circuit * For single power supply +5 V
MICRO COMPUTER
GND
+5V
MICRO COMPUTER
FOCUS BIAS
SSP
SSP
1M
VC
1
33/6.3V
VCC
47k 0.01 24 23 22 21 20 19 18 17 16 15 14 13
GND VEE
VCC
AGCCONT
LC/PD
RFTC
RFO
FE
VCC
100/6.3V
AGCVTH
VEE
FE_BIAS
LD ON
RF_I
RFE
VCC
LD
22
C
33/6.3V
1
2
A
3
4
5
6
7
8
150k
E
9
150k
10
11
EO
PD
B
D
F
EI
12
10H
I-V
I-V
I-V
I-V
22k
500 100
I-V
I-V
GND VC
VC TRK E GAIN
1/6.3V
C
A
B
D
F
E
LD
PD
GND
GND
Connect Pin 23 to VCC when LC is used.
* For dual power supply +2.5 V
+2.5V
MICRO COMPUTER
MICRO COMPUTER
VEE
FOCUS BIAS
22k
VC
VCC
SSP
SSP
1M
GND
1
33/6.3V
VCC
47k 0.01 24 23 22 21 20 19 18 17 16 15 14 13
AGCCONT
LC/PD
RFTC
RFO
FE
VCC
100/6.3V
AGCVTH
VEE
FE_BIAS
LD ON
RF_I
RFE
VCC
LD
22
C
33/6.3V
1
2
A
3
4
5
6
7
8
150k
E
9
150k
10
11
EO
PD
B
D
F
EI
12
10H
22k
I-V
I-V
I-V
500 100
I-V
I-V
VEE GND
I-V
GND TRK E GAIN
1/6.3V
C
A
B
D
F
E
GND
LD
PD
VEE
GND
Connect Pin 23 to VCC when LC is used.
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
--12--
22k
GND
VC
TE
SSP
VC
TE
SSP
CXA2549M
Package Outline
Unit : mm
24PIN SOP (PLASTIC)
+ 0.4 15.0 - 0.1 24 13
+ 0.4 1.85 - 0.15
0.15
+ 0.3 5.3 - 0.1
7.9 0.4
+ 0.2 0.1 - 0.05
0.45 0.1
1.27
+ 0.1 0.2 - 0.05
0.12 M
PACKAGE STRUCTURE
MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SOP-24P-L01 SOP024-P-0300-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY/PHENOL RESIN SOLDER PLATING
COPPER ALLOY / 42ALLOY
0.3g
--13--
0.5 0.2
1
12
6.9

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